Influence of heat treatment on tribological properties of electroless Ni–P and Ni–P–Al2O3 coatings on Al–Si casting alloy

Novák, Michal; Vojtěch, Dalibor; Vítů, Tomáš

doi:10.1016/j.apsusc.2009.11.057

Cited by 66 publications

(37 citation statements)

References 9 publications

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“…At the beginning of the test, the COF values for these two heat treatment temperatures were found to be 0.2, reaching the same value that several studies 14,16,28 with respect to electroless nickel-phosphorus have already found. At the end of the test, COF values were found to be 0.5 and 0.55, respectively, after a gradual increase throughout the time.…”

supporting

confidence: 68%

“…The most of the studies have found that the ideal heat treatment condition in terms of hardness and wear is achieved when heated at 400ºC during 1 hour holding time 10,14,16,18,22 . This condition is proved to reach the structural stability.…”

mentioning

confidence: 99%

“…Several studies have reported that increasing the phosphorus amount above values of 9%P wt., the tendency of an amorphous structure formation is increased, leading to a higher corrosion resistance [7][8][9][10][11][12] . Studies have observed that with appropriate heat treatment (transformation occurred around 340ºC) the metastable amorphous structure could be transformed into an equilibrium fully crystalline structure [13][14][15][16][17][18][19][20][21] . TAHERI 22 has also verified that the higher the content of phosphorus, the greater the formation of Ni 3 P precipitates.…”

mentioning

confidence: 99%

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Wear Behaviour of Electroless heat Treated Ni-P Coatings as Alternative to Electroplated hard Chromium Deposits

Goettems

Ferreira

2017

Mat. Res.

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In this present study was evaluated the influence of heat treatment on the wear resistance of electroless high phosphorus nickel coating (9-10% P wt.). In addition, both untreated and treated Ni-P deposits were then compared to electroplated hard chromium coatings in terms of wear behaviour. Three different heat treatment conditions were performed at temperatures of 320ºC, 400ºC and 500ºC under different holding times. The selection of the heat treatment conditions was chosen considering the results obtained by a differential scanning calorimetry (DSC) analysis. The wear behaviour of the Ni-P samples was investigated through a non-lubricated "ball on plate" test carried out against an Al 2 O 3 counter-face. After an analysis of the friction coefficient, microstructure of the worn surface, width and chemical composition of the wear track, was possible to conclude that the heat treatment affect positively the wear resistance of Ni-P coatings. Treatment conditions of 320ºC with 9 hours holding time and 400ºC with 1 hour holding time showed the best results due to a structural change from amorphous supersatured solid solution of phosphorus in nickel to a crystalline structure of nickel crystallites and nickel phosphides (Ni 3 P) occurred between 320ºC and 360ºC that was verified after x-ray diffraction analysis. Moreover, Ni-P heat treated coatings showed better results when compared to electroplated hard chromium deposits, hence acting as a natural alternative for chromed coatings.

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confidence: 68%

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confidence: 99%

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confidence: 99%

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Wear Behaviour of Electroless heat Treated Ni-P Coatings as Alternative to Electroplated hard Chromium Deposits

Goettems

Ferreira

2017

Mat. Res.

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“…Moreover, the initial load for the evaluation of the heat-treated Ni-P coatings on the AZ91 magnesium alloy was determined to be 8.80 N and the load was increased five times to 44.0 N. The heat treatment can affect the adhesion of the coating to the substrate. As indicated in literature 22 , the creation of Al-Ni intermetallic phases can significantly reduce the adhesion of Ni-P coatings to the AZ91 magnesium alloy after the heat treatment. However, this effect was not observed in the research from reference 2 .…”

Section: Mechanical and Physicochemical Properties Of The Deposited Nmentioning

confidence: 87%

Characterization of Ni-P coating prepared on a wrought AZ61 magnesium alloy via electroless deposition

Buchtík¹,

Kosár²,

Wasserbauer³

et al. 2017

Mater. Tehnol.

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A low-phosphorous Ni-P coating was prepared on a wrought AZ61 magnesium alloy via electroless deposition for 1 h after an adequate substrate-surface pre-treatment. The prepared coating with a thickness of 10 μm was characterized by the uniform distribution of Ni (95.4 % mass fraction) and P (4.6 % mass fraction) in the cross-section. Microcavities present in the coating resulted in quite a low corrosion resistance of the coated magnesium alloy in a 0.1 M NaCl solution. On the other hand, the coating exhibits a high degree of adhesion, as evidenced by a scratch test, and significantly improves the AZ61 magnesium-alloy microhardness. Keywords: electroless nickel, magnesium alloy, AZ61, characterization of Ni-P coatings Malo porozna Ni-P prevleka je bila pripravljena na povr{ini kovane AZ61 magnezijeve zlitine. Prevleka je bila pripravljena z enourno neelektri~no depozicijo na predhodno ustrezno obdelani povr{ini zlitine. Pripravljena prevleka debeline 10 μm je imela v pre~nem prerezu enakomerno porazdelitev Ni (95,4 % masnih odstotkov) in P (4,6 % masnih odstotkov). Zaradi prisotnosti mikropraznin v izdelani prevleki je korozijska odpornost prevle~ene magnezijeve zlitine v 0,1 M NaCl raztopini slaba. Preizkusi razenja prevleke pa so po drugi strani pokazali zelo dober oprijem izdelane prevleke s povr{ino zlitine in znatno izbolj{anje mikrotrdote AZ61 magnezijeve zlitine.

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“…Ethylenediamine is the organic compound with an ammonia-like odor is a powerfully basic amine. Ethylenediamine readily reacts with moisture in humid air to generate a biting, noxious and annoying film, to which even short exposures can cause serious damage to health [10]. Ammonium chloride, an inorganic compound is a white crystal-like salt, highly doable in water.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of mechanical properties on Al 7075 using electroless Ni-P/Ni-B duplex coating with nano SiC

Subramanian¹,

Palaniradja²

2018

IJATEE

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Influence of heat treatment on tribological properties of electroless Ni–P and Ni–P–Al2O3 coatings on Al–Si casting alloy

Cited by 66 publications

References 9 publications

Wear Behaviour of Electroless heat Treated Ni-P Coatings as Alternative to Electroplated hard Chromium Deposits

Wear Behaviour of Electroless heat Treated Ni-P Coatings as Alternative to Electroplated hard Chromium Deposits

Characterization of Ni-P coating prepared on a wrought AZ61 magnesium alloy via electroless deposition

Experimental investigation of mechanical properties on Al 7075 using electroless Ni-P/Ni-B duplex coating with nano SiC

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